Someone outside of our company is sending email using one
of our email addresses as the From: or Reply To:
address. We are receiving the undeliverable messages
when they bounce back. Using the SMTP logs, I have
traced the person and know their IP address and ISP.
I have contacted the ISP (a large national telecom
provider) but have been unable to get any information
about this user or any help from them in getting this to
What options do I have to stop this?